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journal.c

/*
 * journal.c --- code for handling the "ext3" journal
 *
 * Copyright (C) 2000 Andreas Dilger
 * Copyright (C) 2000 Theodore Ts'o
 *
 * Parts of the code are based on fs/jfs/journal.c by Stephen C. Tweedie
 * Copyright (C) 1999 Red Hat Software
 *
 * This file may be redistributed under the terms of the
 * GNU General Public License version 2 or at your discretion
 * any later version.
 */

#ifdef HAVE_SYS_MOUNT_H
#include <sys/param.h>
#include <sys/mount.h>
#define MNT_FL (MS_MGC_VAL | MS_RDONLY)
#endif
#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif

#define E2FSCK_INCLUDE_INLINE_FUNCS
#include "jfs_user.h"
#include "problem.h"
#include "uuid/uuid.h"

#ifdef CONFIG_JBD_DEBUG       /* Enabled by configure --enable-jfs-debug */
static int bh_count = 0;
#endif

/*
 * Define USE_INODE_IO to use the inode_io.c / fileio.c codepaths.
 * This creates a larger static binary, and a smaller binary using
 * shared libraries.  It's also probably slightly less CPU-efficient,
 * which is why it's not on by default.  But, it's a good way of
 * testing the functions in inode_io.c and fileio.c.
 */
#undef USE_INODE_IO

/* Kernel compatibility functions for handling the journal.  These allow us
 * to use the recovery.c file virtually unchanged from the kernel, so we
 * don't have to do much to keep kernel and user recovery in sync.
 */
int journal_bmap(journal_t *journal, blk_t block, unsigned long *phys)
{
#ifdef USE_INODE_IO
      *phys = block;
      return 0;
#else
      struct inode      *inode = journal->j_inode;
      errcode_t   retval;
      blk_t       pblk;

      if (!inode) {
            *phys = block;
            return 0;
      }

      retval= ext2fs_bmap(inode->i_ctx->fs, inode->i_ino, 
                      &inode->i_ext2, NULL, 0, block, &pblk);
      *phys = pblk;
      return (retval);
#endif
}

struct buffer_head *getblk(kdev_t kdev, blk_t blocknr, int blocksize)
{
      struct buffer_head *bh;

      bh = e2fsck_allocate_memory(kdev->k_ctx, sizeof(*bh), "block buffer");
      if (!bh)
            return NULL;

      jfs_debug(4, "getblk for block %lu (%d bytes)(total %d)\n",
              (unsigned long) blocknr, blocksize, ++bh_count);

      bh->b_ctx = kdev->k_ctx;
      if (kdev->k_dev == K_DEV_FS)
            bh->b_io = kdev->k_ctx->fs->io;
      else 
            bh->b_io = kdev->k_ctx->journal_io;
      bh->b_size = blocksize;
      bh->b_blocknr = blocknr;

      return bh;
}

void sync_blockdev(kdev_t kdev)
{
      io_channel  io;

      if (kdev->k_dev == K_DEV_FS)
            io = kdev->k_ctx->fs->io;
      else 
            io = kdev->k_ctx->journal_io;

      io_channel_flush(io);
}

void ll_rw_block(int rw, int nr, struct buffer_head *bhp[])
{
      int retval;
      struct buffer_head *bh;

      for (; nr > 0; --nr) {
            bh = *bhp++;
            if (rw == READ && !bh->b_uptodate) {
                  jfs_debug(3, "reading block %lu/%p\n", 
                          (unsigned long) bh->b_blocknr, (void *) bh);
                  retval = io_channel_read_blk(bh->b_io, 
                                         bh->b_blocknr,
                                         1, bh->b_data);
                  if (retval) {
                        com_err(bh->b_ctx->device_name, retval,
                              "while reading block %lu\n", 
                              (unsigned long) bh->b_blocknr);
                        bh->b_err = retval;
                        continue;
                  }
                  bh->b_uptodate = 1;
            } else if (rw == WRITE && bh->b_dirty) {
                  jfs_debug(3, "writing block %lu/%p\n", 
                          (unsigned long) bh->b_blocknr, (void *) bh);
                  retval = io_channel_write_blk(bh->b_io, 
                                          bh->b_blocknr,
                                          1, bh->b_data);
                  if (retval) {
                        com_err(bh->b_ctx->device_name, retval,
                              "while writing block %lu\n", 
                              (unsigned long) bh->b_blocknr);
                        bh->b_err = retval;
                        continue;
                  }
                  bh->b_dirty = 0;
                  bh->b_uptodate = 1;
            } else {
                  jfs_debug(3, "no-op %s for block %lu\n",
                          rw == READ ? "read" : "write", 
                          (unsigned long) bh->b_blocknr);
            }
      }
}

void mark_buffer_dirty(struct buffer_head *bh)
{
      bh->b_dirty = 1;
}

static void mark_buffer_clean(struct buffer_head * bh)
{
      bh->b_dirty = 0;
}

void brelse(struct buffer_head *bh)
{
      if (bh->b_dirty)
            ll_rw_block(WRITE, 1, &bh);
      jfs_debug(3, "freeing block %lu/%p (total %d)\n",
              (unsigned long) bh->b_blocknr, (void *) bh, --bh_count);
      ext2fs_free_mem(&bh);
}

int buffer_uptodate(struct buffer_head *bh)
{
      return bh->b_uptodate;
}

void mark_buffer_uptodate(struct buffer_head *bh, int val)
{
      bh->b_uptodate = val;
}

void wait_on_buffer(struct buffer_head *bh)
{
      if (!bh->b_uptodate)
            ll_rw_block(READ, 1, &bh);
}


static void e2fsck_clear_recover(e2fsck_t ctx, int error)
{
      ctx->fs->super->s_feature_incompat &= ~EXT3_FEATURE_INCOMPAT_RECOVER;

      /* if we had an error doing journal recovery, we need a full fsck */
      if (error)
            ctx->fs->super->s_state &= ~EXT2_VALID_FS;
      ext2fs_mark_super_dirty(ctx->fs);
}

static errcode_t e2fsck_get_journal(e2fsck_t ctx, journal_t **ret_journal)
{
      struct ext2_super_block *sb = ctx->fs->super;
      struct ext2_super_block jsuper;
      struct problem_context  pctx;
      struct buffer_head      *bh;
      struct inode            *j_inode = NULL;
      struct kdev_s           *dev_fs = NULL, *dev_journal;
      const char        *journal_name = 0;
      journal_t         *journal = NULL;
      errcode_t         retval = 0;
      io_manager        io_ptr = 0;
      unsigned long           start = 0;
      blk_t             blk;
      int               ext_journal = 0;
      int               tried_backup_jnl = 0;
      int               i;
            
      clear_problem_context(&pctx);
      
      journal = e2fsck_allocate_memory(ctx, sizeof(journal_t), "journal");
      if (!journal) {
            return EXT2_ET_NO_MEMORY;
      }

      dev_fs = e2fsck_allocate_memory(ctx, 2*sizeof(struct kdev_s), "kdev");
      if (!dev_fs) {
            retval = EXT2_ET_NO_MEMORY;
            goto errout;
      }
      dev_journal = dev_fs+1;
      
      dev_fs->k_ctx = dev_journal->k_ctx = ctx;
      dev_fs->k_dev = K_DEV_FS;
      dev_journal->k_dev = K_DEV_JOURNAL;
      
      journal->j_dev = dev_journal;
      journal->j_fs_dev = dev_fs;
      journal->j_inode = NULL;
      journal->j_blocksize = ctx->fs->blocksize;

      if (uuid_is_null(sb->s_journal_uuid)) {
            if (!sb->s_journal_inum)
                  return EXT2_ET_BAD_INODE_NUM;
            j_inode = e2fsck_allocate_memory(ctx, sizeof(*j_inode),
                                     "journal inode");
            if (!j_inode) {
                  retval = EXT2_ET_NO_MEMORY;
                  goto errout;
            }

            j_inode->i_ctx = ctx;
            j_inode->i_ino = sb->s_journal_inum;
            
            if ((retval = ext2fs_read_inode(ctx->fs,
                                    sb->s_journal_inum,
                                    &j_inode->i_ext2))) {
            try_backup_journal:
                  if (sb->s_jnl_backup_type != EXT3_JNL_BACKUP_BLOCKS ||
                      tried_backup_jnl)
                        goto errout;
                  memset(&j_inode->i_ext2, 0, sizeof(struct ext2_inode));
                  memcpy(&j_inode->i_ext2.i_block[0], sb->s_jnl_blocks, 
                         EXT2_N_BLOCKS*4);
                  j_inode->i_ext2.i_size = sb->s_jnl_blocks[16];
                  j_inode->i_ext2.i_links_count = 1;
                  j_inode->i_ext2.i_mode = LINUX_S_IFREG | 0600;
                  tried_backup_jnl++;
            }
            if (!j_inode->i_ext2.i_links_count ||
                !LINUX_S_ISREG(j_inode->i_ext2.i_mode)) {
                  retval = EXT2_ET_NO_JOURNAL;
                  goto try_backup_journal;
            }
            if (j_inode->i_ext2.i_size / journal->j_blocksize <
                JFS_MIN_JOURNAL_BLOCKS) {
                  retval = EXT2_ET_JOURNAL_TOO_SMALL;
                  goto try_backup_journal;
            }
            for (i=0; i < EXT2_N_BLOCKS; i++) {
                  blk = j_inode->i_ext2.i_block[i];
                  if (!blk) {
                        if (i < EXT2_NDIR_BLOCKS) {
                              retval = EXT2_ET_JOURNAL_TOO_SMALL;
                              goto try_backup_journal;
                        }
                        continue;
                  }
                  if (blk < sb->s_first_data_block ||
                      blk >= sb->s_blocks_count) {
                        retval = EXT2_ET_BAD_BLOCK_NUM;
                        goto try_backup_journal;
                  }
            }
            journal->j_maxlen = j_inode->i_ext2.i_size / journal->j_blocksize;

#ifdef USE_INODE_IO
            retval = ext2fs_inode_io_intern2(ctx->fs, sb->s_journal_inum,
                                     &j_inode->i_ext2,
                                     &journal_name);
            if (retval)
                  goto errout;

            io_ptr = inode_io_manager;
#else
            journal->j_inode = j_inode;
            ctx->journal_io = ctx->fs->io;
            if ((retval = journal_bmap(journal, 0, &start)) != 0)
                  goto errout;
#endif
      } else {
            ext_journal = 1;
            if (!ctx->journal_name) {
                  char uuid[37];

                  uuid_unparse(sb->s_journal_uuid, uuid);
                  ctx->journal_name = blkid_get_devname(ctx->blkid,
                                                "UUID", uuid);
                  if (!ctx->journal_name)
                        ctx->journal_name = blkid_devno_to_devname(sb->s_journal_dev);
            }
            journal_name = ctx->journal_name;
                  
            if (!journal_name) {
                  fix_problem(ctx, PR_0_CANT_FIND_JOURNAL, &pctx);
                  return EXT2_ET_LOAD_EXT_JOURNAL;
            }
            
            jfs_debug(1, "Using journal file %s\n", journal_name);
            io_ptr = unix_io_manager;
      }

#if 0
      test_io_backing_manager = io_ptr;
      io_ptr = test_io_manager;
#endif
#ifndef USE_INODE_IO
      if (ext_journal)
#endif
            retval = io_ptr->open(journal_name, IO_FLAG_RW,
                              &ctx->journal_io);
      if (retval)
            goto errout;

      io_channel_set_blksize(ctx->journal_io, ctx->fs->blocksize);

      if (ext_journal) {
            if (ctx->fs->blocksize == 1024)
                  start = 1;
            bh = getblk(dev_journal, start, ctx->fs->blocksize);
            if (!bh) {
                  retval = EXT2_ET_NO_MEMORY;
                  goto errout;
            }
            ll_rw_block(READ, 1, &bh);
            if ((retval = bh->b_err) != 0)
                  goto errout;
            memcpy(&jsuper, start ? bh->b_data :  bh->b_data + 1024,
                   sizeof(jsuper));
            brelse(bh);
#ifdef EXT2FS_ENABLE_SWAPFS
            if (jsuper.s_magic == ext2fs_swab16(EXT2_SUPER_MAGIC)) 
                  ext2fs_swap_super(&jsuper);
#endif
            if (jsuper.s_magic != EXT2_SUPER_MAGIC ||
                !(jsuper.s_feature_incompat & EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
                  fix_problem(ctx, PR_0_EXT_JOURNAL_BAD_SUPER, &pctx);
                  retval = EXT2_ET_LOAD_EXT_JOURNAL;
                  goto errout;
            }
            /* Make sure the journal UUID is correct */
            if (memcmp(jsuper.s_uuid, ctx->fs->super->s_journal_uuid,
                     sizeof(jsuper.s_uuid))) {
                  fix_problem(ctx, PR_0_JOURNAL_BAD_UUID, &pctx);
                  retval = EXT2_ET_LOAD_EXT_JOURNAL;
                  goto errout;
            }
            
            journal->j_maxlen = jsuper.s_blocks_count;
            start++;
      }

      if (!(bh = getblk(dev_journal, start, journal->j_blocksize))) {
            retval = EXT2_ET_NO_MEMORY;
            goto errout;
      }
      
      journal->j_sb_buffer = bh;
      journal->j_superblock = (journal_superblock_t *)bh->b_data;
      
#ifdef USE_INODE_IO
      if (j_inode)
            ext2fs_free_mem(&j_inode);
#endif

      *ret_journal = journal;
      return 0;

errout:
      if (dev_fs)
            ext2fs_free_mem(&dev_fs);
      if (j_inode)
            ext2fs_free_mem(&j_inode);
      if (journal)
            ext2fs_free_mem(&journal);
      return retval;
      
}

static errcode_t e2fsck_journal_fix_bad_inode(e2fsck_t ctx,
                                    struct problem_context *pctx)
{
      struct ext2_super_block *sb = ctx->fs->super;
      int recover = ctx->fs->super->s_feature_incompat &
            EXT3_FEATURE_INCOMPAT_RECOVER;
      int has_journal = ctx->fs->super->s_feature_compat &
            EXT3_FEATURE_COMPAT_HAS_JOURNAL;

      if (has_journal || sb->s_journal_inum) {
            /* The journal inode is bogus, remove and force full fsck */
            pctx->ino = sb->s_journal_inum;
            if (fix_problem(ctx, PR_0_JOURNAL_BAD_INODE, pctx)) {
                  if (has_journal && sb->s_journal_inum)
                        printf("*** ext3 journal has been deleted - "
                               "filesystem is now ext2 only ***\n\n");
                  sb->s_feature_compat &= ~EXT3_FEATURE_COMPAT_HAS_JOURNAL;
                  sb->s_journal_inum = 0;
                  ctx->flags |= E2F_FLAG_JOURNAL_INODE; /* FIXME: todo */
                  e2fsck_clear_recover(ctx, 1);
                  return 0;
            }
            return EXT2_ET_BAD_INODE_NUM;
      } else if (recover) {
            if (fix_problem(ctx, PR_0_JOURNAL_RECOVER_SET, pctx)) {
                  e2fsck_clear_recover(ctx, 1);
                  return 0;
            }
            return EXT2_ET_UNSUPP_FEATURE;
      }
      return 0;
}

#define V1_SB_SIZE      0x0024
static void clear_v2_journal_fields(journal_t *journal)
{
      e2fsck_t ctx = journal->j_dev->k_ctx;
      struct problem_context pctx;

      clear_problem_context(&pctx);

      if (!fix_problem(ctx, PR_0_CLEAR_V2_JOURNAL, &pctx))
            return;

      memset(((char *) journal->j_superblock) + V1_SB_SIZE, 0,
             ctx->fs->blocksize-V1_SB_SIZE);
      mark_buffer_dirty(journal->j_sb_buffer);
}


static errcode_t e2fsck_journal_load(journal_t *journal)
{
      e2fsck_t ctx = journal->j_dev->k_ctx;
      journal_superblock_t *jsb;
      struct buffer_head *jbh = journal->j_sb_buffer;
      struct problem_context pctx;

      clear_problem_context(&pctx);

      ll_rw_block(READ, 1, &jbh);
      if (jbh->b_err) {
            com_err(ctx->device_name, jbh->b_err,
                  _("reading journal superblock\n"));
            return jbh->b_err;
      }

      jsb = journal->j_superblock;
      /* If we don't even have JFS_MAGIC, we probably have a wrong inode */
      if (jsb->s_header.h_magic != htonl(JFS_MAGIC_NUMBER))
            return e2fsck_journal_fix_bad_inode(ctx, &pctx);

      switch (ntohl(jsb->s_header.h_blocktype)) {
      case JFS_SUPERBLOCK_V1:
            journal->j_format_version = 1;
            if (jsb->s_feature_compat ||
                jsb->s_feature_incompat ||
                jsb->s_feature_ro_compat ||
                jsb->s_nr_users)
                  clear_v2_journal_fields(journal);
            break;
            
      case JFS_SUPERBLOCK_V2:
            journal->j_format_version = 2;
            if (ntohl(jsb->s_nr_users) > 1 &&
                uuid_is_null(ctx->fs->super->s_journal_uuid))
                  clear_v2_journal_fields(journal);
            if (ntohl(jsb->s_nr_users) > 1) {
                  fix_problem(ctx, PR_0_JOURNAL_UNSUPP_MULTIFS, &pctx);
                  return EXT2_ET_JOURNAL_UNSUPP_VERSION;
            }
            break;

      /*
       * These should never appear in a journal super block, so if
       * they do, the journal is badly corrupted.
       */
      case JFS_DESCRIPTOR_BLOCK:
      case JFS_COMMIT_BLOCK:
      case JFS_REVOKE_BLOCK:
            return EXT2_ET_CORRUPT_SUPERBLOCK;
            
      /* If we don't understand the superblock major type, but there
       * is a magic number, then it is likely to be a new format we
       * just don't understand, so leave it alone. */
      default:
            return EXT2_ET_JOURNAL_UNSUPP_VERSION;
      }

      if (JFS_HAS_INCOMPAT_FEATURE(journal, ~JFS_KNOWN_INCOMPAT_FEATURES))
            return EXT2_ET_UNSUPP_FEATURE;
      
      if (JFS_HAS_RO_COMPAT_FEATURE(journal, ~JFS_KNOWN_ROCOMPAT_FEATURES))
            return EXT2_ET_RO_UNSUPP_FEATURE;

      /* We have now checked whether we know enough about the journal
       * format to be able to proceed safely, so any other checks that
       * fail we should attempt to recover from. */
      if (jsb->s_blocksize != htonl(journal->j_blocksize)) {
            com_err(ctx->program_name, EXT2_ET_CORRUPT_SUPERBLOCK,
                  _("%s: no valid journal superblock found\n"),
                  ctx->device_name);
            return EXT2_ET_CORRUPT_SUPERBLOCK;
      }

      if (ntohl(jsb->s_maxlen) < journal->j_maxlen)
            journal->j_maxlen = ntohl(jsb->s_maxlen);
      else if (ntohl(jsb->s_maxlen) > journal->j_maxlen) {
            com_err(ctx->program_name, EXT2_ET_CORRUPT_SUPERBLOCK,
                  _("%s: journal too short\n"),
                  ctx->device_name);
            return EXT2_ET_CORRUPT_SUPERBLOCK;
      }

      journal->j_tail_sequence = ntohl(jsb->s_sequence);
      journal->j_transaction_sequence = journal->j_tail_sequence;
      journal->j_tail = ntohl(jsb->s_start);
      journal->j_first = ntohl(jsb->s_first);
      journal->j_last = ntohl(jsb->s_maxlen);

      return 0;
}

static void e2fsck_journal_reset_super(e2fsck_t ctx, journal_superblock_t *jsb,
                               journal_t *journal)
{
      char *p;
      union {
            uuid_t uuid;
            __u32 val[4];
      } u;
      __u32 new_seq = 0;
      int i;

      /* Leave a valid existing V1 superblock signature alone.
       * Anything unrecognisable we overwrite with a new V2
       * signature. */
      
      if (jsb->s_header.h_magic != htonl(JFS_MAGIC_NUMBER) ||
          jsb->s_header.h_blocktype != htonl(JFS_SUPERBLOCK_V1)) {
            jsb->s_header.h_magic = htonl(JFS_MAGIC_NUMBER);
            jsb->s_header.h_blocktype = htonl(JFS_SUPERBLOCK_V2);
      }

      /* Zero out everything else beyond the superblock header */
      
      p = ((char *) jsb) + sizeof(journal_header_t);
      memset (p, 0, ctx->fs->blocksize-sizeof(journal_header_t));

      jsb->s_blocksize = htonl(ctx->fs->blocksize);
      jsb->s_maxlen = htonl(journal->j_maxlen);
      jsb->s_first = htonl(1);

      /* Initialize the journal sequence number so that there is "no"
       * chance we will find old "valid" transactions in the journal.
       * This avoids the need to zero the whole journal (slow to do,
       * and risky when we are just recovering the filesystem).
       */
      uuid_generate(u.uuid);
      for (i = 0; i < 4; i ++)
            new_seq ^= u.val[i];
      jsb->s_sequence = htonl(new_seq);

      mark_buffer_dirty(journal->j_sb_buffer);
      ll_rw_block(WRITE, 1, &journal->j_sb_buffer);
}

static errcode_t e2fsck_journal_fix_corrupt_super(e2fsck_t ctx,
                                      journal_t *journal,
                                      struct problem_context *pctx)
{
      struct ext2_super_block *sb = ctx->fs->super;
      int recover = ctx->fs->super->s_feature_incompat &
            EXT3_FEATURE_INCOMPAT_RECOVER;

      if (sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL) {
            if (fix_problem(ctx, PR_0_JOURNAL_BAD_SUPER, pctx)) {
                  e2fsck_journal_reset_super(ctx, journal->j_superblock,
                                       journal);
                  journal->j_transaction_sequence = 1;
                  e2fsck_clear_recover(ctx, recover);
                  return 0;
            }
            return EXT2_ET_CORRUPT_SUPERBLOCK;
      } else if (e2fsck_journal_fix_bad_inode(ctx, pctx))
            return EXT2_ET_CORRUPT_SUPERBLOCK;

      return 0;
}

static void e2fsck_journal_release(e2fsck_t ctx, journal_t *journal,
                           int reset, int drop)
{
      journal_superblock_t *jsb;

      if (drop)
            mark_buffer_clean(journal->j_sb_buffer);
      else if (!(ctx->options & E2F_OPT_READONLY)) {
            jsb = journal->j_superblock;
            jsb->s_sequence = htonl(journal->j_transaction_sequence);
            if (reset)
                  jsb->s_start = 0; /* this marks the journal as empty */
            mark_buffer_dirty(journal->j_sb_buffer);
      }
      brelse(journal->j_sb_buffer);

      if (ctx->journal_io) {
            if (ctx->fs && ctx->fs->io != ctx->journal_io)
                  io_channel_close(ctx->journal_io);
            ctx->journal_io = 0;
      }
      
#ifndef USE_INODE_IO
      if (journal->j_inode)
            ext2fs_free_mem(&journal->j_inode);
#endif
      if (journal->j_fs_dev)
            ext2fs_free_mem(&journal->j_fs_dev);
      ext2fs_free_mem(&journal);
}

/*
 * This function makes sure that the superblock fields regarding the
 * journal are consistent.
 */
int e2fsck_check_ext3_journal(e2fsck_t ctx)
{
      struct ext2_super_block *sb = ctx->fs->super;
      journal_t *journal;
      int recover = ctx->fs->super->s_feature_incompat &
            EXT3_FEATURE_INCOMPAT_RECOVER;
      struct problem_context pctx;
      problem_t problem;
      int reset = 0, force_fsck = 0;
      int retval;

      /* If we don't have any journal features, don't do anything more */
      if (!(sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL) &&
          !recover && sb->s_journal_inum == 0 && sb->s_journal_dev == 0 &&
          uuid_is_null(sb->s_journal_uuid))
            return 0;

      clear_problem_context(&pctx);
      pctx.num = sb->s_journal_inum;

      retval = e2fsck_get_journal(ctx, &journal);
      if (retval) {
            if ((retval == EXT2_ET_BAD_INODE_NUM) ||
                (retval == EXT2_ET_BAD_BLOCK_NUM) ||
                (retval == EXT2_ET_JOURNAL_TOO_SMALL) ||
                (retval == EXT2_ET_NO_JOURNAL))
                  return e2fsck_journal_fix_bad_inode(ctx, &pctx);
            return retval;
      }

      retval = e2fsck_journal_load(journal);
      if (retval) {
            if ((retval == EXT2_ET_CORRUPT_SUPERBLOCK) ||
                ((retval == EXT2_ET_UNSUPP_FEATURE) &&
                (!fix_problem(ctx, PR_0_JOURNAL_UNSUPP_INCOMPAT,
                          &pctx))) ||
                ((retval == EXT2_ET_RO_UNSUPP_FEATURE) &&
                (!fix_problem(ctx, PR_0_JOURNAL_UNSUPP_ROCOMPAT,
                          &pctx))) ||
                ((retval == EXT2_ET_JOURNAL_UNSUPP_VERSION) &&
                (!fix_problem(ctx, PR_0_JOURNAL_UNSUPP_VERSION, &pctx))))
                  retval = e2fsck_journal_fix_corrupt_super(ctx, journal,
                                                  &pctx);
            e2fsck_journal_release(ctx, journal, 0, 1);
            return retval;
      }

      /*
       * We want to make the flags consistent here.  We will not leave with
       * needs_recovery set but has_journal clear.  We can't get in a loop
       * with -y, -n, or -p, only if a user isn't making up their mind.
       */
no_has_journal:
      if (!(sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
            recover = sb->s_feature_incompat & EXT3_FEATURE_INCOMPAT_RECOVER;
            pctx.str = "inode";
            if (fix_problem(ctx, PR_0_JOURNAL_HAS_JOURNAL, &pctx)) {
                  if (recover &&
                      !fix_problem(ctx, PR_0_JOURNAL_RECOVER_SET, &pctx))
                        goto no_has_journal;
                  /*
                   * Need a full fsck if we are releasing a
                   * journal stored on a reserved inode.
                   */
                  force_fsck = recover ||
                        (sb->s_journal_inum < EXT2_FIRST_INODE(sb));
                  /* Clear all of the journal fields */
                  sb->s_journal_inum = 0;
                  sb->s_journal_dev = 0;
                  memset(sb->s_journal_uuid, 0,
                         sizeof(sb->s_journal_uuid));
                  e2fsck_clear_recover(ctx, force_fsck);
            } else if (!(ctx->options & E2F_OPT_READONLY)) {
                  sb->s_feature_compat |= EXT3_FEATURE_COMPAT_HAS_JOURNAL;
                  ext2fs_mark_super_dirty(ctx->fs);
            }
      }

      if (sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL &&
          !(sb->s_feature_incompat & EXT3_FEATURE_INCOMPAT_RECOVER) &&
          journal->j_superblock->s_start != 0) {
            /* Print status information */
            fix_problem(ctx, PR_0_JOURNAL_RECOVERY_CLEAR, &pctx);
            if (ctx->superblock)
                  problem = PR_0_JOURNAL_RUN_DEFAULT;
            else
                  problem = PR_0_JOURNAL_RUN;
            if (fix_problem(ctx, problem, &pctx)) {
                  ctx->options |= E2F_OPT_FORCE;
                  sb->s_feature_incompat |=
                        EXT3_FEATURE_INCOMPAT_RECOVER;
                  ext2fs_mark_super_dirty(ctx->fs);
            } else if (fix_problem(ctx,
                               PR_0_JOURNAL_RESET_JOURNAL, &pctx)) {
                  reset = 1;
                  sb->s_state &= ~EXT2_VALID_FS;
                  ext2fs_mark_super_dirty(ctx->fs);
            }
            /*
             * If the user answers no to the above question, we
             * ignore the fact that journal apparently has data;
             * accidentally replaying over valid data would be far
             * worse than skipping a questionable recovery.
             * 
             * XXX should we abort with a fatal error here?  What
             * will the ext3 kernel code do if a filesystem with
             * !NEEDS_RECOVERY but with a non-zero
             * journal->j_superblock->s_start is mounted?
             */
      }

      e2fsck_journal_release(ctx, journal, reset, 0);
      return retval;
}

static errcode_t recover_ext3_journal(e2fsck_t ctx)
{
      journal_t *journal;
      int retval;

      journal_init_revoke_caches();
      retval = e2fsck_get_journal(ctx, &journal);
      if (retval)
            return retval;

      retval = e2fsck_journal_load(journal);
      if (retval)
            goto errout;

      retval = journal_init_revoke(journal, 1024);
      if (retval)
            goto errout;
      
      retval = -journal_recover(journal);
      if (retval)
            goto errout;
      
      if (journal->j_superblock->s_errno) {
            ctx->fs->super->s_state |= EXT2_ERROR_FS;
            ext2fs_mark_super_dirty(ctx->fs);
            journal->j_superblock->s_errno = 0;
            mark_buffer_dirty(journal->j_sb_buffer);
      }
            
errout:
      journal_destroy_revoke(journal);
      journal_destroy_revoke_caches();
      e2fsck_journal_release(ctx, journal, 1, 0);
      return retval;
}

int e2fsck_run_ext3_journal(e2fsck_t ctx)
{
      io_manager io_ptr = ctx->fs->io->manager;
      int blocksize = ctx->fs->blocksize;
      errcode_t   retval, recover_retval;

      printf(_("%s: recovering journal\n"), ctx->device_name);
      if (ctx->options & E2F_OPT_READONLY) {
            printf(_("%s: won't do journal recovery while read-only\n"),
                   ctx->device_name);
            return EXT2_ET_FILE_RO;
      }

      if (ctx->fs->flags & EXT2_FLAG_DIRTY)
            ext2fs_flush(ctx->fs);  /* Force out any modifications */

      recover_retval = recover_ext3_journal(ctx);
      
      /*
       * Reload the filesystem context to get up-to-date data from disk
       * because journal recovery will change the filesystem under us.
       */
      ext2fs_close(ctx->fs);
      retval = ext2fs_open(ctx->filesystem_name, EXT2_FLAG_RW,
                       ctx->superblock, blocksize, io_ptr,
                       &ctx->fs);

      if (retval) {
            com_err(ctx->program_name, retval,
                  _("while trying to re-open %s"),
                  ctx->device_name);
            fatal_error(ctx, 0);
      }
      ctx->fs->priv_data = ctx;

      /* Set the superblock flags */
      e2fsck_clear_recover(ctx, recover_retval);
      return recover_retval;
}

/*
 * This function will move the journal inode from a visible file in
 * the filesystem directory hierarchy to the reserved inode if necessary.
 */
static const char * const journal_names[] = {
      ".journal", "journal", ".journal.dat", "journal.dat", 0 };

void e2fsck_move_ext3_journal(e2fsck_t ctx)
{
      struct ext2_super_block *sb = ctx->fs->super;
      struct problem_context  pctx;
      struct ext2_inode       inode;
      ext2_filsys       fs = ctx->fs;
      ext2_ino_t        ino;
      errcode_t         retval;
      const char * const *    cpp;
      int               group, mount_flags;
      
      clear_problem_context(&pctx);

      /*
       * If the filesystem is opened read-only, or there is no
       * journal, then do nothing.
       */
      if ((ctx->options & E2F_OPT_READONLY) ||
          (sb->s_journal_inum == 0) ||
          !(sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL))
            return;

      /*
       * Read in the journal inode
       */
      if (ext2fs_read_inode(fs, sb->s_journal_inum, &inode) != 0)
            return;

      /*
       * If it's necessary to backup the journal inode, do so.
       */
      if ((sb->s_jnl_backup_type == 0) ||
          ((sb->s_jnl_backup_type == EXT3_JNL_BACKUP_BLOCKS) &&
           memcmp(inode.i_block, sb->s_jnl_blocks, EXT2_N_BLOCKS*4))) {
            if (fix_problem(ctx, PR_0_BACKUP_JNL, &pctx)) {
                  memcpy(sb->s_jnl_blocks, inode.i_block,
                         EXT2_N_BLOCKS*4);
                  sb->s_jnl_blocks[16] = inode.i_size;
                  sb->s_jnl_backup_type = EXT3_JNL_BACKUP_BLOCKS;
                  ext2fs_mark_super_dirty(fs);
                  fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
            }
      }

      /*
       * If the journal is already the hidden inode, then do nothing
       */
      if (sb->s_journal_inum == EXT2_JOURNAL_INO)
            return;
      
      /*
       * The journal inode had better have only one link and not be readable.
       */
      if (inode.i_links_count != 1)
            return;

      /*
       * If the filesystem is mounted, or we can't tell whether
       * or not it's mounted, do nothing.
       */
      retval = ext2fs_check_if_mounted(ctx->filesystem_name, &mount_flags);
      if (retval || (mount_flags & EXT2_MF_MOUNTED))
            return;

      /*
       * If we can't find the name of the journal inode, then do
       * nothing.
       */
      for (cpp = journal_names; *cpp; cpp++) {
            retval = ext2fs_lookup(fs, EXT2_ROOT_INO, *cpp,
                               strlen(*cpp), 0, &ino);
            if ((retval == 0) && (ino == sb->s_journal_inum))
                  break;
      }
      if (*cpp == 0)
            return;

      /* We need the inode bitmap to be loaded */
      retval = ext2fs_read_bitmaps(fs);
      if (retval)
            return;

      pctx.str = *cpp;
      if (!fix_problem(ctx, PR_0_MOVE_JOURNAL, &pctx))
            return;
            
      /*
       * OK, we've done all the checks, let's actually move the
       * journal inode.  Errors at this point mean we need to force
       * an ext2 filesystem check.
       */
      if ((retval = ext2fs_unlink(fs, EXT2_ROOT_INO, *cpp, ino, 0)) != 0)
            goto err_out;
      if ((retval = ext2fs_write_inode(fs, EXT2_JOURNAL_INO, &inode)) != 0)
            goto err_out;
      sb->s_journal_inum = EXT2_JOURNAL_INO;
      ext2fs_mark_super_dirty(fs);
      fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
      inode.i_links_count = 0;
      inode.i_dtime = time(0);
      if ((retval = ext2fs_write_inode(fs, ino, &inode)) != 0)
            goto err_out;

      group = ext2fs_group_of_ino(fs, ino);
      ext2fs_unmark_inode_bitmap(fs->inode_map, ino);
      ext2fs_mark_ib_dirty(fs);
      fs->group_desc[group].bg_free_inodes_count++;
      fs->super->s_free_inodes_count++;
      return;

err_out:
      pctx.errcode = retval;
      fix_problem(ctx, PR_0_ERR_MOVE_JOURNAL, &pctx);
      fs->super->s_state &= ~EXT2_VALID_FS;
      ext2fs_mark_super_dirty(fs);
      return;
}


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